#1301 nvim uses LuaJIT 2.1 -> lua 5.1

.luarc.json

@@ -1,12 +1,14 @@
 {
 	"$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
+	"runtime.version" : "Lua 5.1",
 	"diagnostics": {
 		"globals": {
 			"vim": true
 		},
 		"disable": {
 			"lowercase-global": true,
-			"missing-parameter": true
+			"missing-parameter": true,
+			"trailing-space": true
 		}
 	}
 }

lua/nvim-tree/diagnostics.lua

@@ -92,7 +92,7 @@ local function from_coc()
 
   for bufname, severity_list in pairs(diagnostics) do
     if not buffer_severity[bufname] then
-      local severity = math.min(table.unpack(severity_list))
+      local severity = math.min(unpack(severity_list))
       buffer_severity[bufname] = severity
     end
   end